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Software Defined Radio: Past, Present and Future

It’s hard to believe that the term “software defined radio” (SDR) has been around for about 30 years. That’s a long time in the technology world. And though it’s still a common topic of discussion to this day, SDR carries more than its share of misconceptions. According to the Wireless Innovation Forum (formerly the SDR Forum), SDR is “a radio in which some or all of the physical-layer functions are software defined.” Though the term focuses on the physicallayer (PHY) processing of the waveform, it is not related to the radio frequency (RF) front end. This is one of the common misconceptions around SDR. Thirty years later, it’s almost a given that any radio is an SDR. In fact, the SDR is now such a dominant industry standard—from military tactical radios to cellular handsets—that there’s seemingly no end in sight to their potential. Continued SDR innovations in semiconductor and software technology drive higher development productivity and more cost-effective products. These factors indicate that SDRs are really a solved problem and that radios are now evolving into frequency-agile intelligent communication systems
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